Improvement in balance piston-valves for steam-engines



waited' tatra CHARLES W. rnsMAlnor carcasa,ILLINOIS.I

Letters Patent N 92,231, datedJfuly 6, 1869,

IMPROVEMENT IN .BALANCE PISTON-VALVES FOR STEAM-ENGINES.

The Schedule referred to these Letters Patent and making part of the same.

To whom it may concern Be it known that I, CHARLES W. TnnMAIN, of Chicago, in the county of Cook, and State of Illinois, have invented anew and useful Improvement in Balanced Piston-Valves for Steam-Engines; and I do declare that the following is a true and accurate description thereof, reference being'had to the accompanying drawings, and to the letters of reference marked thereon, and being a part of this specification.

Figure 1 is a side elevation of my steam-chest, with one of the peek-hole plates removed, to show the relative position ofthe valve underneath, with its port.

Figure 2 is a longitudinal section of my steam-chest, as apphed to a cylinder of ordinary construction.

Figure 3 is an end view of my steam-chest, with the cover removed, and a portion of the follower brokep out, to show the method of setting out the packingring.

lfigure 4 is a view of my wedge and screw for setting out the rings.

Like letters indicate like parts in each figure.

'Ihe nature of this invention relates to an improvement in the construction of balanced piston-valves for steam and water-engines, as secured to me by and described in my Letters Patent, dated September 19, 1865, and numbered 50,053; and consists in such a construction and arrangement of the steam-chest designed for my valve, that it may be easily and readily bolted to the valve-seat of au ordinary cylinder, upon which a slide-valve had been used; iu providing the annular steam-passages in the chest with peek-holes and covers,'\vhich ycovers may be removed so as to show the position ofthe valve-piston while setting the valve; and ina new andnovel arrangement of wedges operated by set-'screws for expanding or setting out .the packing-rings.

1n the drawings- K represents a steam-chest, cylindrical in form, and provided with encircling recesses or grooves A, for the admission of the steam to the steam-ports A' in the valve-seat of "au ordinary cylinder, J, to which the chest is attached, while B is a similar recess for exhausting the steam therefrom at the`completion of each stroke.

1n the construction ot' large engines, where it is inexpedient to east the cylinder and steam-chest together, and in applying this improvement to ordinary cylinders, I forni a recess, G, in the bottom ofthe chest at each end, and through the bottom of this recess a hole is drilled, through which passes a headed or stud-bolt and nut, I, which is tapped into the seat ofthe cylinder J, the bott-om ofthe steam-chest being planed to form a steam-tight joint with the flat valveseat of the cylinder.

D is an annular seat, perforated at intervals, to allow the steam entering the ends of the cllestthrough the side-pipes C, to pass into the annular recessesA,

when said openings are uncovered bythe pistons, and from thence into the ports A' of the cylinder alternately,

the direction of ihe dow of steam being shown by the arrowsl in lig. 2 of the drawings.

E, lig. 2, is a hollowl cylindrical valve, with its ends arranged to receive the piston-rings L and M, the last of which is solid, and the former are cut t0 permit of their being expanded against the seat, to prevent leakage of steam. The ring L being solid,it breaks joints with the divided rings, and prevents the steam from blowing through from the steam to the exhaustside of the piston. Ihe setting out or expansion of the divided rings is effected by the insertion of a wedge, P, between the ends vof the rings, and operated by a'. set-screw, S, tapped 'through from the interior of the valve. This wedge operates ou both rings, and is recessed out iu its central portion, so as to straddle the solid ringl M, the rings being held iu place by a follower. F,'bolted to the piston-head.

The valve is secured to the stem H in the usual Vmillillel'.

O are peep-holes iu the annular recesses A, on the side ofthe steam-chest, through which the position' of the valves may be observed while the latter are being set.

2. 'Ihe construction of the annular valve-seat D,

with reference to thev cylindrical steam-chest, substantially as described.

3. The construction ofthe recessed double wedge P, and its arrangement with the set-screws S, for expanding the outerrpaoking-rings of Apistou-valves, substantially as herein set forth.

4. The arrangement of the peep-holes 0 in the annular steam-passages A, in reference to the valve E, substantiallyas herein set forth.

C. W. TREMAIN'.

\Vitnesses f H."F. EBER'rs, Jas. I. DAY. 

